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Restructuring Charges - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | ||||
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Restructuring Cost and Reserve [Line Items] | ||||||
| Restructuring charges | $ 212,000 | $ 201,000 | $ 106,000 | $ 246,000 | $ 519,000 | $ 837,000 |
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China Subsidiary
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| Restructuring Cost and Reserve [Line Items] | ||||||
| Restructuring charges | 519,000 | |||||
| Number of positions eliminated | 50 | |||||
| Operating expenses | 1,200,000 | |||||
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Shanghai facility
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| Restructuring Cost and Reserve [Line Items] | ||||||
| Restructuring charges | 112,000 | |||||
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Toronto, Canada, Idle Facility
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| Restructuring Cost and Reserve [Line Items] | ||||||
| Restructuring charges | $ 175,000 | |||||